Canon EF14mm f/2.8L USM

Overview

The original 14mm ultrawide prime, whilst not bad, really shows how lens coatings and design has improved over the years. Shows distinct vignetting and corner softness, with a propensity for showing flare. Compare to the 2007 14mm mkII

Closer sagittal and meridional chart lines indicate more 'natural' out of focus areas.

Remember that MTF charts are good for comparing similar lenses, so comparing ones from the 14mm f2.8L and 300mm 2.8L won't tell you much at all, whilst comparing the EF14 2.8L with the EF14 2.8L II will show meaningful differences. Note that other manufacturers may have different ways of displaying such information that may or may not match up with the Canon figures.